超临界二氧化碳输送钢管制造工艺以及钢管
By using a combination of nickel-chromium-molybdenum alloy steel welding wire, H08MnMoTiB welding wire and H08A welding wire, and fluorine-alkali flux, the welding process parameters were optimized, which solved the problems of hydrogen-induced delayed cracking and stress corrosion cracking at the weld joint of CO2 pipelines, and improved the safety and brittle fracture resistance of the pipelines under extreme conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA NAT PETROLEUM CORP
- Filing Date
- 2026-06-17
- Publication Date
- 2026-07-17
AI Technical Summary
In existing technologies, the diffusible hydrogen content at the weld joints of CO2 pipelines is too high, leading to hydrogen-induced delayed cracking and stress corrosion cracking, which is particularly prominent in acidic corrosive environments and under high restraint stress, affecting pipeline safety.
A combination of nickel-chromium-molybdenum alloy steel welding wire, H08MnMoTiB welding wire, and H08A welding wire, along with fluorine-alkali flux and optimized process parameters, ensures that the weld metal has low diffusible hydrogen levels, high crack arrest toughness, and resistance to stress corrosion under ultra-low temperature and acidic conditions. By optimizing welding process parameters and material composition, the accumulation of diffusible hydrogen in the weld is reduced.
It effectively inhibits the accumulation of diffusing hydrogen in the weld, solves the problems of hydrogen-induced delayed cracking and stress corrosion cracking, and improves the safety and brittle fracture resistance of CO2 pipelines under extreme conditions.
Smart Images
Figure CN122401010A_ABST